Process of making plasters, &amp;c.



' UNITED STATES PATENT OFFICE.

WILLY LOEBELL, OF KLEIN-ZSCHACHWITZ, NEAR DRESDEN, GERMANY.

PROCESS OF MAKING PLASTERS, 81.0.

A Specification of Letters Patent.

Patented Oct. 3, 1905.

Application filed December 29, 1904. Serial No. 238,855.

To all 1071/0122, it may concern:

Be it known that I, WILLY LoEBnLL, a subject of the German Emperor, anda resident of Klein-Zechachwitz, near Dresden, in the Kingdom of Saxonyand Empire of Germany, have invented certain new and useful Improvementsin Processes for the Manufacture of Plasters and Bases for Ointments,Salves, and the Like, of which the following is a specification.

This invention relates to improvements in the manufacture of plasters,bases for ointments, salves, &c., and has to do particularly withplasters or bases containing viscine.

Viscine has not as yet been successfully used as a base for plasters andthe like owing to the difiiculty encountered in preserving the plastersin a soft and plastic condition while in use. This defect has resultedfrom the use of volatile solvents in initially treating the ingredientof the plaster or salve. In using benzin as a solvent the plaster afterbeing applied to the body soon becomes hard and brittle, losing theproperties of adhesiveness, toughness, and pliability. A plaster in thiscondition does not exclude the air and, further, forms a hardmassadhering only in parts to the surface to which it is applied, therebyfailing entirely to efi ectively perform its function. In the use ofsalves and ointments containing viscine treated by volatile solvents,

such as benzin, the mass applied soon hardens and cracks, admitting theair to the wound and requiring frequent renewal of the salve.Furthermore, the employmentof a volatile solvent in preparations of thisnature requires that the original package must be put up and carefullysealed, whereas with nonvolatile solvents the cost of putting thepreparation in marketable packages is greatly lessened.

By means of my improved process I am enabled to use viscine in themanufacture of plasters, salves, and the like in a manner to fullyutilize its curative and other valuable medicinal properties. Thisresult is attained To this end my improved process consists generally inthe addition to viscine of a suitable non-volatile solventsuch, forinstance,

as the petroleum products, fats, waxes, resins,

gum-resins or camphor-and in subsequently mixing the same thoroughly.The mixture is then subjected to a steam-bath and heated to atemperature of approximately 100 centigrade. For the manufacture of abase for salves or ointments sixty grams of viscine and anon-volatilesolvent, preferably Vaseline, are mixed in proportions of, say, fortygrams of the latter, the resulting mass being heated for a suitable timeover a steam or water bath and subjectedto the required agitation. Theresulting productis then in a marketable state. The proportions may ofcourse be varied in accordance with the nature of the plasters orointments and the purposes for which the same are to be used. Thesechanges, however, are in view of the disclosure made clearly within theprovince of the skilled chemist or pharmacist.

The resulting product has the very valuable property of excluding airand inducing the rapid healing of wounds due to burns and can be veryconveniently applied to moist wounds, such as eczema and the like. Theproduct readily forms emulsions with various liquids and is not attackedby cold water. When the product is used as a plaster, it can be veryreadily removed from the surface to which it is applied by theapplication thereto of a warm soap solution, the aid of benzin, ether,or alcohol, which act as irritants and are at present required for theremoval of known plasters being thus avoided.

What I claim is 1. The herein-described process consisting in theaddition to viscine of a non-volatile solvent and in subsequentlysubjecting the mixture to the application of heat and agitation.

2. The herein-described process consisting in the addition toviscine ofVaseline and in subsequently subjecting the mixture to a steam or waterbath and the required agitation.

In testimony whereof I affix my signature in presence of two witnesses.

- lVlLLY LOEBELL.

Witnesses:

MORRIS LIPMAN, FREDERICK J. DIETZMAN.

